A relative of Dzhokhar Tsarnaev says she remains convinced he had nothing to do with the Boston Marathon bombing, arguing that neither he nor his now-dead elder brother had any reason to carry out the terrorist attack.

Tsarnaev was found guilty on Wednesday of all 30 counts against him, and now the same jury in Boston must decide whether he should be sentenced to death or to life in prison.

Roza Tsarnaeva, a 66-year-old cousin of Tsarnaev's father, told The Associated Press in Chechnya that she is "completely convinced that they were not guilty of this."

Relatives of the Tsarnaev brothers in Chechnya, the republic in southern Russia that is the family's ancestral homeland, have consistently expressed disbelief that the brothers carried out the April 2013 bombing.